Can you fly without altimeter?

Can you take off without a functioning altimeter? No. As answered elsewhere, FAR part 91 defines the minimum equipment required for flight (airspeed, altitude, compass, power). it is currently a legal requirement to have an altimeter in your airplane.



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The Federal Aviation Regulation (FAR) Part 91.119 indicates that, except when necessary for departure or landing, the minimum altitude over urban areas is 1,000 feet above ground level (AGL) and 500 feet AGL over rural areas.

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“What is the purpose of the altimeter reading given to pilots by ATC?” That is the local barometric reading, so the pilots can adjust their altimeter to the same reading to show the correct and accurate altitude for the area at that time. That's very important for landing.

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You reset your altimeter to match local, nonstandard station pressure readings, using the Kollsman window on your altimeter. This is usually done every 100NM for aircraft flying below FL180.

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When you set your altimeter to 29.92, you're flying at standard pressure altitude. This is the altitude of the aircraft above the standard datum plane, the theoretical location where at 15 degrees Celsius the altimeter setting will equal 29.92 inches of mercury.

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The most common cause of gear-up landings is the pilot simply forgetting to extend the landing gear before touchdown. On any retractable gear aircraft, lowering the landing gear is part of the pilot's landing checklist, which also includes items such as setting the flaps, propeller and mixture controls for landing.

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Because the Earth is a three-dimensional sphere and not merely a two-dimensional flat, East-West surface. Because of this spherical shape, often times the shortest distance is flying more north and south, up over the Northern latitudes and the North Pole, rather than flying east/west over the Pacific.

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